Fluid mixer



Slluentors GttornegsA May 19, 1931. .1. v. GIESLER ET AL FLUID MIXER Filed Feb. ll

i Patented May v1.9, 1931 UNITED STATES PATENT oFl-ICE JEAN v. GIEsLEE' AND WILLIAM W. cAEsoN,'JE., or xNoxvILLE, TENNESSEE, As- SIGNoEs To THE rUL'roN sYLPHoN coMPANr, or xNoxvILLE, TENNESSEE, A CoE- PORATION OF DELAWARE i ELU1D` MIXER f Application led February 11, 1928. Serial No. 253,779.

rl`his invention relates to thermostatically controlled means for heating a fluid by mlx- -ing another heated fluid-therewith, and

more particularly 'l to apparatus of this type for heating Water by mixing steam theree -erate size, Where large storage tanks are impracticable or undesirable for one reason or another, the mixture of the fluids such as Water and steam has been accomplished drectly in the pipe line conducting the water to the desired points. It has also been proposed'to combine with such apparatus a suitable thermostatic control means subjected to the temperature of the heated Water in the pipe line and operating a suitable control valve placed usually in the steamsupply line. It has been found, however, that the regulationthereby obtained is far from satisfactically all thermostats have a certain amount oflag and do not respond instantly to heat variations. The Water or otherv fluid, however, being treated in comparatively small quantities during its flow through the mixingdevice, undergoes temperature variations which are substantially instantaneous. An excess of heating fluid for any reason, such as a variation in the supply pressure, will thus l produce a quick substantial rise of the tem perature of the fluid to be heated, and'yet the supply of the heating fluid will not be diminished for an appreciable interval due to the lag of the thermostatic element. On the other hand, when the 'thermostatic control means'does respond to diminish the supply of heating fluid, or when such supply diminishes for any other reason, the temperature of the iuid to be heated falls practically instantaneously, Whereas the supply of heating Huid-is not again increased until after the lag of the thermostatic element has been overcome. As` a result, the temperature of the heated fluid delivered from the apparatus frequentlyl varies over a wide range between approximate maximum and minimum temperatures, and the desired evenly regulated and accurately controlled temperature is not obtained. The temperature of the Water in such cases may readily become so high that serious danger of scalding results before the thermostatic element can act to control the supply of heating fluid.

v One of the objects of the present inven tion is to obviate the above disadvantages and to provide a novel fluid heater of the character described which is capable of evenly and accurately regulating the temperature of the fiuidsfiowing therefrom.

Another object is to provide a thermostati cally controlled fluid heater wherein variations Yof temperature dueto lag of the ther` mostatic elementprv elements are effectively f prevented. l

A further object is the provision of a heating system of the character described having means' therein whereby overheating, when the' flow of fluid therefrom is stopped, Will be prevented. tory. This i's due largely to the fact that prac- A still further object is to provide a heating system wherein a substantial body of Huid is heated by means of circulation through .a heating device which is thermostatically controlled according tothe tem'- perature of such body, therebyl stabilizing the action of the thermostatic element in response to such variations in the temperature of the fluid to be heated.

A further object is the provision of novel, and improved means formixing a heatin fluid such vas steam with a fluid to be heate such as Water.

' Another object is the provision of a novel and improved form of nozzle to be employed .in conjunction with a mixer for steam and water or the like.

Other objects Will appear hereinafter as the descriptionl of the invention proceeds.

With these objects in view, the invention, broadly stated, includes the provision with a suitable mixing device of stabilizing means such as a small tank or other suitable reservoir for accurately controlling the thermostatic elementassociated with the mixin device. The desired fluids areconducted rom any suitable sources lto the mixing device, and then to the stabilizing tank, means beingv preferably provided to establish a continuous circulation from the mixing-device to the tank and then back toy the mixing device whereby the entire body of water in the stabilizing tank is brought to the desired [temperature. The thermostatic control element is subjected to the temperature of the stabilizing tank. The fluid from the mixing device, which is subject to the variations above described, is thus mixed with the larger body of water in the stabilizing tank, and the i circulation abovedescribed provides for gradually bringing the .temperature ofthe tank to the desired point thus eliminating the sudden variations in temperature of the fluidv withdrawn therefrom. Furthermore, the rate of withdrawal of fluid from the tank i is sufficiently small compared to the volume of water in the tank that therate of change of temperature inthe latter will notbe'in excess of the capacity of the thermostatic velement to control the supply of heating fluid tothe mixing device. It will be understood, however, that while the reservoir may vary somewhat in size, it need be large only in relation to the quantity of water in the mixing device, and does not constitute a storage tank A for hot wateras that term is understood in the art.

-One embodiment of the invention has been illustrated in the accompanying drawings,

but it is to be expressly understood that said drawings are for the purposes of illustration only and are not to be construed as defining the limits of the invention, reference being had to the appended claims for In the drawings, Fig. 1 is a diagrammatic view of a heating system constructed `according to the inven-I tion; and

Fig. 2 is a detail view showing thefluid mixing device. V Y v Referring now to the drawings, wherein vlike reference numerals indicate like parts',l

the heating fluid and the fluid to be heated, which are hereinafter referred to for simplicity as steam and water, may be supplied to the apparatus by any suitable means which are represented inthe drawings by the pipes 1 and 2 respectively, preferably controlled by' suitable stop valves 3 and 4. Preferably, although not necessarily, suitable means are i provided for preliminarily heating said wa.

ter before it reaches the mixing device, and to this end the lpipe 2 is shown as connected to a suitable tank 5, which is heated'bgy7 any suitable means such as the coil 6. rlhe lwater thus heatedv is conducted 'by a pipe 7 to a `check valve 8 of any suitable type,- and thence this purpose.

by a pipe to a suitable fluid mixing device, preferably ofthe type described hereinafter.

The steam is preferably lconducted by the pipe 1 to a suitable check valve 10, and thence by a pipe 11 to a suitable control valve' 12,

lwhich is thermostatically controlled preferand coil 6 constitute a refinement not neces-A sary in all cases, and where omitted, the water and steam are conducted directly from pipes 2 and 11 respectively to pipes 7 and 14. Valve y12 may also be connected to the pipes 11 and 13 in reversed relation tothat illustrated, so that the inlet pressure is admitted to the chamber between the valve seats shown.

` The fluid mixing device is preferably of the type wherein water or other fluid is heated by injecting steam or the like therein, and delivers' the heated water to a suitable tank or other reservoir 15, from which the water may be withdrawn as required through the pipe 16. Any suitable or desired type of fluid mixer may be employed. Preferably,

however, said fluid mixer comprises a plurality of concentric tubular or .annular passages, suitably communicating with one another to provide for the desired mixing of' provide for the mixing-of the fluids which are' then delivered to the 'reservoir 15. Still another passage may be and preferably is provided, whereby fluid from the reservoir 15v may be returned to the mixing device, heated,

and returned again to the reservoir to establish: a continuous circulation therebetween.

Referring now to F ig. 2, wherein is shown by way of example the preferred form of mixing device, the fluid mixer comprises a suitable body member 17, connected with the tank 15 in any suitable manner, as by means of an outer tubular member 18. The member 18 is attached at one end to the wall of the tank in any suitable way, as by 'welding at 19, and at its other end to the body member 17 preferably by means of a ring 20 threaded at 21 on the endof the member 18, and suitably connected with a flange 22 of the body, 17 as by means of bolts 'or screws 23.

Concentric with said member 18 and within the same, are'a plurality of additional tubular members supported in 1 any suitable manner, and constituting with said member a central vtubular passage and a plurality of surrounding concentric annular passages. In the form shown, a second tubular member 24, of smaller diameter than the member 18, is threaded' into the end of the body 17 and forms a cont-inuation thereof to the reservoir, preferably extending well within the same for a purpose hereinafter described. Between the members 24 and 18 is thus formed an annular passage 25 open at one end into the reservoir and wclosed at the 'other end by the flange 22, except for a plurality of openings 26 in the member 24.A A third and central tubular member 27 is supported in the 'mixing device, preferably having threaded engagement at 28 with the walls Aof a central passage 29 formed in the body 17. Between the member 27 and the member 24 is formed a second annular passage 30, vopen at both ends and communicating through openings 26 with the passage 25, and within the member 27 is'formeda central tubular passage l31, preferably having at its upper end a suitable mixing device such as hereinafter described.

The body 17 is provided with a pair of inlet openings 32 and 33, one of said inlets 32 being suitably connected with the steam supply pipe 14 and communicating with the central body passage 29, and the other of said inlets 33`f being suitably connected with the water supply pipe 9 and communicating with an annular passage 34 in the body 17 which surrounds the central passage 29.I The water from the supply pipe 9 enters the inlet 33,

, flows through theannular passage 34 into the annular passage 30, and discharges into the reservoir 15;

' pose of During its flow through the passage 30, the water is heated by mixing steam or steam condensate therewith. To this end, the steam from the pipe 14 enters the inlet 32, and flows through the passage 29 and the' passage 31'to a suitable device for injecting said steam into the water iiowing around said device, which device may, for example, comprise a nozzle of anysuitable or desired type. In the' form shown, said nozzle is an inverted coneshaped member,.threaded at its base 36 on the en'd of the member 27. The nozzle member is provided with a plurality of small open` ings 37, which are preferably disposed in radial planes and at an angle to the axis of the cone asshown in Fig. 1, whereby the steam passing therethrough is injected into the water flowing around the nozzle in the direction of flow of the water. For the purpose of insuring that a thin layer of water shall pass in contact with the nozzle to be heated heated by the steam, and for the further purdecreasing the noise which usually results nozzle 35 may be guard38, preferably also cone-shaped, and

from mixing steam withwater, the surrounded by a suitable open' at both ends. The guard 38 may be supported in any suitable manner, as by means of a spider 39 attached to the inner end of the nozzle 35 by any suitable means such as a screw 40.

As hereinbefore indicated, the supply of steam to the mixing device is thermostatically@ regulated in accordance with the temperature of the water in the tank 15. Any suitable type of thermostatic control may be employed for this purpose, and in the form shown the valve "12 in the steam supply line is operated Aby a thermostatic control device of the type shown in the patent to WV. M. Fulton, No. 1,591,085. As shown, the saidthermostatic device comprises a frame 41.sup.J ported at one end on the stuffing box 42 of the body of the valve 12. A valve stem 43 operatively connectedwith the valve 12 passes through the stufling box 42 and cap nut 44 andis attached to a rod 45. The rod 45 slides in a guide 46 which isthreaded into a supporting member 47 preferably constituting a part of the frame 41. The other end of the rod 45 is attached to the cup-shaped movable head 48 of a thermostat comprising a collapsible and expansible wall 50 attached at one end to the head 48 and at the other end to a stationary head 51. The heads 48 and 51, together with the wall 50 constitute a thermos-tatie vessel of a type well known in the art. A tubular extension 52 of the head 51 is exteriorly threaded to engage an interiorly threaded collar or nut 53 inserted in a suitable opening in the tank 16 and preferably soldered thereto. A tube 54 communicates with the thermostatic vessel and is located in a bulb 55 adapted to contain the thermostatic fluid and preferably soldered to the end of the extension 52. The bulb 55 is preferably located substantially in the center of reservoir 15. As the bulb increases or decreases the thermostatic fluid will expand or contract the ther'- mostatic vessel, thereby causing'movement of the movable head 48 which carries with it the rod 45,'valve stem 43, and valve 12. Movement of the movable head 48 is preferably regulated by a spring 56, bearing at one end against said head and at the other 5,

end against a seat 57 cooperating with an adjusting nut 58 threaded on the tubular guide 46.

The operation of the apparatus will be apparent from the foregoing description, and may be stated briefly as follows: As-

` suming thatwater is being withdrawn from the tank through outlet 16, and that the valves 3 and 4 are open, water passes through the pipe 2 into the tank .5. where it is heated bysteam passing through the pipe l, check valve 10, control valve l2` and heating coil 6. The water from the tank 5 passes through the check valve 8 and thence to the inlet pas- 4sagte 33 of the mixing device, the annular conthe pressure of the fluid in tinuation thereof-34, thefpassage 30 around ."thefnozzle 35, and into the tank 15. The

l the tank. Thev heated water from around the nozzle will, therefore, rise int-o the tank, and

'" the cold water in the bottom of the tank will tend to pass outwardly therefrom through f the annularpassage 25 and openings 26 into the passage 30, and thence around the noz-v zle and backy to the tank 15. The rate of' withdrawal lfrom the tank being small as com.- pared with the volume of water in the tank, the temperature in the tank will gradually though rapidly rise until the desired point is reached, when the therinos'tatic control element will act to decrease or shut off the supply of steam through the valve 12. If the frate of withdrawal from-the tank 15 issuch that the temperature within the tank new tends tofall, thecontrol valve 12 will open an amount dependent on the amount of de-` crease of temperature in the tank, `and the thermostat will continue to properly properg tion the amount of opening of the valve 12 in accordance withv the temperature in the tank; Since the rate of withdrawal `of the water through the pipe 16 is in all cases relatively'small compared to the volume of water in the tank 1 5, any change of temperature in v the tank 15` will be gradual and will not beso sudden as toexceed the capacity of the .thermostatic element t'ov correspondinglyV regulate the valve 12. In other words, sudden changes in the temperature in the tank 15 will be avoided, tb which the thermostatic control, element would not quickly respond,

and an evenly and accurately regulated teniperature in tle flow from the pipe 16 will therefore be obtained. 4

- supply line prevents the water -from backingv up .in the steam line.-

The pressure of the steam admitted to the mixing deviceis ,normally higher than the pressure of the'water. admitted thereto, as is necessarily, the case for purposes of injection of the steam into the water. If for any reasonl the steam pressure should fall below that of the water, the check valve 10 in' the steain valve 8 in the water supply line'prevents the steam from backingup in said line when the outlet 16 is closed. The arrangement of check valves shown has the furtherA important advantage of automaticz'llly stoppingthe flow of steam t'o the heatingdevice when the outlet 16 is closed and no water -is being withdrawn from the tank 15. .This is due to the Likewise the check factthat as soon as the outlet 16 is closed, the pressure in the-tank 15 and in the water line as far as the check valve 8 immediately vbuilds up to the pressure of the inlet steam.

same time, as soon as the pressure vin the tank 15 is relieved by .opening the outlet 16, steam will atonce flow into the fluid mixer at a rate governed-by the position of the valve, which thelwater in the-tank 15 as influenced by the rate of outflow. l It-will thus be perceived that the apparatus in turn is controlled by the temperature of functions as an instantaneous fluid heater,

wherein heating of the fluid begins automatically whenA the discharge is opened and stops automatically when the discharge is closed. In other words, while the discharge is closed, as explained above, no steam can flow into the mixing device because of the equalization of the pressure in the system with the steamsupply pressure. On the other hand, as soon as the discharge is opened, the pressure in the system is immediately re'- lieved and steam at once commences to flow into the mixing-device, continuing until the discharge 4is -again closed. Thel operation of the thermostat is to position the control valve 12 so as to properly proportion the 'amount of the steam flowing into the mixer to the rate of withdrawal of water from the tank, and thus to obtain an evenly regulated discharge temperature as- .explained above, whereas i practice theactual admission of steam to the mixer and the shutting off of the supply are governedby the discharge from the apparatus. l

One of the purposes ofthe baiile or guard 38 for the nozzle 35, as previously indicated, kis to decrease the noise usually encountered in mixing steam with water. Said guard may not be necessary in all. cases. For example, whenthe embodiment shown in the drawing is running at a lowpraportion of its total capacity, the steam will be totally condensed when-passing through the coil 6 and the function of the guard will not be required. On the other hand, if the apparatus is operatingy at a .comparatively high proportion otits total capacity, the surface ofthe heating coil 6 may not be su cient to condense all the steam, and some noise wouldbe` incurred in mixin the uncondensed steam lwith the water. this latter' case the nozzle shouldv be provided` with a suitable guard as shown in order-to eliminatethis noise. However, the surfa'cof the coil 6 may be made large enough to condense all of the steam at the, total capacity of the apparatus, in which case the guard would not be necessary. In other words, by employing `the tank 5 and coil 6, and by properlyproportioning the surface of the coil with respect to the amount of steam required, the mixture may be made entirely noiseless. If for any reason this result is not accomplished by the tank 5 and coil 6, the guard or baflle 38 may be combined with the nozzle' in order to prevent noise, thus enabling the use of a:r smaller coil 6 and tank 5. The disposition of the holes 37 in the nozzle and their relation to the baffle 38 aid both in reducing the noise and facilitating the flow of the Water through the passage 30 and between the guards and thc i* nozzle.

It will therefore be perceived that the present invention avoids the necessity fora storage tank while at theysame time it eliminates the disadvantages and'dangerous conditions incident to prior structures for heating Water and other liquids by direct interinixture therewith of the heating medium, such as steam. lBy maintaining the proper relation between the volume of Water in the stabilizing tank orreceptacle and the lag of the thermostat, the receptacle may be made relatively small While substantial fluctuation of temperature is eliminated because the capacity of the volume of Water in the recepta'cle to changetemperature is on the same order as the capacity of the thermostat to respond to the changes of temperature.

While only one embodiment of the invention has been described and illustrated, for purposes of exemplification, it will now be readily apparent to those skilled in the art that other embodiments may be made and 1 that changes may be made in the construction and arrangement of the parts 4vvithout departing from the spirit of the invention.

While the embodiment illustrated includes the tank 5 and coil 6, it is to be expressly understood that the invention may be used Without the interposition ot these elements, in which case the entire heating of the. Waterv will take place in the fluid mixer heretoforeV described. This embodiment of the invention is available 'Where the noise of injecting steam into Water is not objectionable, and possesses the advantage of greater simplicity and less consumption of space. Reference is therefore to be had to the appended claims Y for a definition of the limits of the invention.

' of the mixture within said stabilizing receptacle to control the ysupply of said heating fiuid.

2. "In apparatus of the class described, the

vice formixing a heating fluid with a fluid to be heated, means supplying fluids to said device, means conducting mixed fluids to said stabilizing receptacle, means providing a return circulation from the receptacle to said device, thermostatic control means subjected to the temperature within said stabilizing.

receptacle to control the supply of heating fiuid, and ymeans for discharging fluid from said receptacle.

4. In apparatus of the class described, the combination of a stabilizing receptacle, preheating means for heating a fluid by heat supplied from a second fluid, a device operatively connected with said means for mixing said fluids, means operatively connecting said device With said stabilizing receptacle, thermo-4 static control means subjected to the temperature Within said stabilizing receptacle for controlling the supply of' said second fluid, 'and means for discharging fluid from said stabilizing receptacle.

5.- In apparatus of the class described, the

combination of a stabilizing receptacle, means for heating a fluid by heat supplied from a ,secondi fluid, a device operatively connected with said means for mixing said fluid, means operatively connecting said device with said `stabilizing receptacle and adapted to cause circulation from the receptacle to the device and then to the receptacle, thermostatic control means subjected to the temperature Within said stabilizing receptacle for controlling the supply of said second fluid, and means for discharging fluid from said stabilizing receptacle.

6. In apparatus of the class described, the i combination of a stabilizing receptacle, means for heating a fluid by heat supplied from a second fiuid, a 'device operatively connected with said means for mixing said fluids, means conducting mixed fluids to said stabilizing receptacle, means providing a return circulation from said receptacle to said device, thermostatic control means subjected to the temperature within said stabilizing receptacle for controlling the'supply of said second fluid,"and means for discharging fluid from said stabilizing receptacle.

7. In apparatus of the class described, the combination of a stabilizing receptacle having a volume which 'is relatively large as compared with the volumes of fluid being mixed at any one time, a device for mixing a heating fluid with a fluid to be heated and delivering mixed fluids to said stabilizing receptacle, supply lines for conducting said fluids to said device, and a one-Way valve in each of said supply lines. l

8. In apparatus of the class described', the combination of a stabilizing receptacle, a device for mixing a heating fluid with a fluid to be heated, means connecting said device with saidstabilizing receptacle, supply lines for conducting fluids to said device, thermostatic control meanssubjected to the temperature within said stabilizing receptacle and occupying only a relatively small portion of the volume of said receptacle tou convtrol the supply of said heating `fluid, and a check valve in eachv of said supply lines.

9. In combination with a fluid mixing device ofthe ty e wherein hot and cold fluids are caused to ow continuouslyl therethrough whereby the fluids are mixed in relatively small quantities, 'a stabilizing reservoir for said mixed fluids having a volume large as compared with said quantities and thermostatic control means subjected to the temperature within said stabilizing reservoir and controlling the supply of hot fluid'to said de'- vice. 30 10. In a fluid heating system of the `type wherein hot and cold fluids are conducted through a mixing device to a discharge means whereby relatively small quantities of fluid are continuously heated, the combination vwith said system of a stabilizing reservoir interposed between said' mixing device and discharge having a volume which is large as compared with the flow through said device and a thermostaticallylcontrolled valve subjected to i the temperature within said stabilizing reserto said device.

11. "In a fluid heating system of the type voir and controlling the supply of hot fluid wherein hot and cold fluids. are conductedl through a mixing device to adischarge whereby relatively small quantities of `Huid are heated durin flow, the combination with said system o a stabilizing 4reservoir interposed between said device and said discharge and having a volume'which is large 'as compared with the flow through said device, means pro` vidi-ng return circulation between said stabilizing reservoir and said device, and thermo- Y static valve control means subjected to the 55 temperature within said stabilizing reservoir and controlling the supply of hot fluid to said device.

12. Apparatus of prising in combination a steam supply lin'e, a .control valve therein, a water supply line, a device operatively connected to said linesfor mixing said steam and water, a stabilizing reservoir operatively connected with said de- 1yA large as compared with the volumes oflluid prisin the class" described comlmixer, and thermostatic -means operatively being mixed at any one time, and thermostatic means operatively connected with said valve and subjected to the temperature within said stabilizing reservoir. n

13. Apparatus of the class described comprising in combination a stealn supply line, a control valve therein, a water supply line, a device operatively connected to said lines for mixing saidsteam and water, a stabilizing reservoir operatively connected with said device, a return conduit connecting said stabilizing'reservoir and device, and thermostaticv means operatively connected with said control valve and subjected to the temperature within said stabilizing reservoir.. 80

14. Apparatus of the class described com-v prising in combination a steam supply line, a water supply line, a check valve in each line, a' control valve in said steam supply line, a device operatively connected with said lines for mixing said steam and water, a stabilizing reservoir operatively connected with said device, a return conduit from s aid stabilizing reservoir to said device, and thermostatic means subjected to the temperature within said reservoir and operatively connected with said control valve.

15. Apparatus of the-class describedy comprising in combination a steam supply line, a control valve therein, a water supply line, a tank in saidiwater line, a heating coil in said tank connected with said steam line, a steam and water mixer operatively connected with said coil and tank, a stabilizing reservoir eonnectedwith said mixer, and thermostatic means subjected to thetemperature of said stabilizing. reservoir and operatively connected with said valve.

Y 16. Apparatus of the class described coinprising in combination a steam' supply line,

'mixer, and thermostatic means subjected to thetemperature ofsaid stabilizing rervoir and operatively connected with .said valve;

17. Apparatus of the classdescribed comvin combination a steam supply line, a chec valve therein, a control valve therein, a water tank, a heating coil therein' connected to said steam line,fa steam and water mixer, Water and steam conduits connecting said mixer with said tank and coil, a check valve in said water conduit, a stabilizing reservoir operatively connected with said connected with said control valve, and'subjected to the temperature of said stabilizing reservoir. A v1ce` and having a volume whlch 1s relative- 18. In'apparatus of the class described,

the combination of a fluid 4mixing device 130 105 a control valve therein, a water supply line,

having a plurality of concentric passages, one of said passages terminating in aC4 second passage, m'eans conducting hot and cold fluids to said passages, and a reservoir, said second passage terminating within said reservoir and a third of said passages connecting said reservoir with said second passage.

19. In apparatus of the class described, the combination of a iuid mixing device having a plurality of `concentric passages, means conducting hot and cold iiuids thereto, one of said passagesterminating within a second passage to mix said fluids, and a reservoir, said second passage terminating within said reservoir and a third of said passages connecting said reservoir with ,said second passage outwardly ofthe termination therein of said rst passage. i

20. 'In apparatus of 'the class described, the combination of a. fluid mixing device havinga plurality of concentric passages,

means conducting hot and cold fluids to respective passages therein, the hot fluidpassage terminating in the cold fluid passage to -mix the fluids, a reservoijsaid cold fluid passage discharging within said reservoir, and a third of said passages connecting said reservoir to said cold fluid passage outwardly of the termination therein of'said'hot iiuid passage.

21. In Vapparatus of the class described, the `combination of a iiuid mixing device having a plurality of concentric passages,

" means conducting hot fluid to the innerof said. passages and cold fluid to an intermediate passage, said innerv passage termil nating in said intermediate passage to mix the fluids, and a reservoir said Vintermediate passage discharging into said reservoir and the` outer of said passages connecting said p reservoir with said intermediate passage outwardly of the termination therein of said inner passage.v

- 22. In apparatus of the classdescribed,

the combination of a uid mixin device having three tubular membersforming condiate tubular member extending Within said f centric passages, a reservoir, the intermereservoir, the inner tubular member terminating in. `said intermediate member` and having nozzle means at its end, and the outer tubularV member extending outwardly from said reservoir past said nozzle means and communicatingmith the passage within said 'i intermediate member, and means conducting a hot fluid to the passage within said inner member and cold fluid to the passage within saidintermediatemember:

' 23. In apparatus of the class described, u the combination of a body member having a central passage and a concentric annular passage, Aa reservoir, a tubular member extending said annular passage withir" said reservoir, a nozzle within said tubular mem-. ber, means connecting said nozzle with said v annular passage.

central passage, an outer tubular member spaced from said first-named tubular member and connected with said reservoir, said y first-named tubular member having openings between said nozzle and said body member, means conducting steam :to said central passage, and means conducting water to said connecting said nozzle with said central passage, an outeil tubular member carried by.

said body member and spaced from said first-named tubular member to form an outer annular passage, 4said outer tubular member extending to said opening, said inner tubular member having openings ad] acent said body member whereby said outer annular'passage and inner annular passage are in communication, means conducting steam to said central passage, and means lconducting water to said annular surroundin g passage.

25. fIn a fluid mixer, a fluid passage, a nozzle associated with said passage and having a plurality of openings distributed both axiallyIand circumferentially of said nozzle, a second fluid passage surrounding said nozzle, and an imperforate baffle surrounding and spaced from said nozzle.

.Y 26. :Ina fluid mixer, a hollow substantially conical nozzle having openings through its walls distributed both circumferentially and axially thereof, a conduit delivering Huid to said nozzle, a fluid passage surrounding said nozzle, and a baille surrounding and and spaced from said nozzle and open at both ends.

27. In a fluid mixer, a hollow substantially conical nozzle, means delivering fluid to the interior thereof, said nozzle having an opening through its wall at anangle to the axis of the cone, a fluid passage surrounding said nozzle, and a substantially conical baiie surrounding and spaced from said nozzle.

28. In a fluid mixer, a hollow conicalnozzle, means delivering fluid thereto, a fluid passage surrounding said nozzle,'said nozzle having a plurality of openings each at an acute angle to the axis ofthe cone andextending inthe direction of How of Huid in said passage, and a frusto-conical bafli'e in said passage surrounding and spaced from said nozzle.

29. A fluid nozzle comprising ajhollow cone-shaped body` adapted to receive fluid at its base and having a plurality of openings an imperforate conical baille surroumling said body. f

30. Av flu1d nozzle comprising a hollow cone-shaped' body adapted to receive fluid atits .base and having a plurality of openings through the wall thereof, said openings lying in radial planes atan acute angle to the axis of the cone measured from the tip thereof, and a baflle approximately parallel to and spaced from the nozzle openings.

3l. The combination with a hollow coni; cal member having a plurality of nozzle openings therethrough, of a frusto-conical baille melnber surrounding and spaced approximately evenly from said conical member and open at both ends.

32. A heating system automatically operative to heat fluid when'fluid is withdrawn from said system comprising the comhina tion of a mixer for hot and cold fluids, a reservoir operatively connected with said mixer to receive mixed fluids therefrom, fluid discharge means for said reservoir, and means controlling the admission of hot `fluids to said mixer in accordance with the discharge from said reservoir.

33. An automatic heating system comprising in combination .pressure supply means for heating fluid, a' fluid supply and heating system normally closed to escape of fluids therefrom and normally in open `communication with said pressure supply means, and discharge meansv for said system wherebyv when said discharge means is opened the pressure within said normallyclosed system is substantially instantaneously relieved to permit said heating fluid to flow into the system. i

34. A heating system automatically operative to heat fluid when fluid iswithdrawn therefrom.,comprising in combination pressure supply means for a heating fluid, a fluid supply and heating system including a fluid mixing device and means for supplying cold -fluid thereto, said system being normally closed to the escape of fluids therefrom and in open communication with said pressure supply means, and discharge means for said system whereby when said discharge means is open the pressure within said normally closed system is relieved and said-heating fluid flows into the mixing device.

35. A" heating system operative to heat fluid when fluid is withdrawn therefrom comprising in combination a fluid system including a fluid m1xer and a normally closed reservoir connected therewith, means for supplying heatin fluid under pressure to said mixer, means or supplying cold fluid to said mixer, one-way control means for said lastnamed means whereby said'mixer, reservoir and' cold fluid supply means constitute a closed pressure chamber wherein said heating fluid supply means terminates in open communication therewith, and discharge means for said reservoir whereby when said last-named means is opened the pressure within said closed pressure chamber .is relieved and heating fluid flows into the system.

36.'A pressure controlled: heating system operative to heat fluid when fluid is withdrawn therefrom comprising in combina-- tion one-way supply means forhot and cold fluids, a fluid mixer connected with said means, a reservoir normally closed except for comml'mication with said mixer, said reservoir, mixer and one-way cold fluid supply means constituting a closed pressure system to which said hot fluid supplyl means is in open communication, and a discharge means for said reservoir operative to relieve the pressure in said closed system whereby hot i fluid flows through said mixer.

37. A heating system automatically operative to heat fluid when fluid is withdrawn from said system comprising the combination of a mixer for hot and cold fluids, a reservoir operatively connected with said mixer to receive mixed fluids therefrom, fluid discharge means for said reservoir, means in open communication with said mixer for admitting hot fluid to said mixer in accordance with rie discharge from 'said reservoir, and thermostatic control-meansA subjected to the temperature within said reservoir to propor@ tion, the amount of hot fluid admitted in accordance with said temperature.

38. An automatic heating system comprising in combination pressure supply means for a heating fluid, a fluid supply and heating system normally closed tothe escape of fluid therefrom and normally in open communication with said pressure supply means, discharge means for said system whereby the pressure within the same may be relieved to permit said heating fluid to flow into said system, and thermostatic control means to lproportion the amount of heating Huid in accordance lwith the temperature of said discharged fluid.y

39. A heating vsystem automatically operatiVe to heat fluid when fluid is withdrawn therefrom comprising in combination pressure supply means for a heating fluid, a fluid supply and heating system including a fluid mixing device, and means for supplying cold fluid thereto, said system being normally closed to the escape of fluid therefrom and in prising in combination a fluid system includfluid whenfluid is withdrawn therefrom coming a fluid mixer and a normally closed reservo1r connected therewith, means Flying heating Huid under pressure to saicPmlxer, means supplying cold fluld to said mlxer, oneway control means for said last-named means whereby said mixer, reservoir and cold uld supply means constitute a closed pressure system wherein said heating uid supply means terminates in opencomunication therewith,

discharge means for said reservoir whereby the pressure within said closed system is relieved and vheating iuid flows to said mixer, and thermostaticcontrol means subjected to the temperature within said reservoir and,

proportioning the amount of heatin uid lowin to said mixer to the rate o withdrawa vof the Huid dischargedfrom' said reservoir.

41. A pressure-controlled heatin system automatically operative to heat iiuid when Huid is withdrawn"y therefrom comprising in combination one-way supply means for hot and coldl luids, a iiuid mixer connected with said' means, a reservoir. normally closed except for communication with said mixer, said reservoir, mixer' and one-way cold fluid supply means constituting a closed pressure system to which saidhot fluid supply means is in open communication, a discharge means for said reservoir operative to relieve the pressure in said closed system whereby hot Huid Hows through said mostatic control means su tioning the amount of hot iuid flowing through said mixertothe rate of withdrawal of iiuid from said reservoir to maintain an even temperature of discharge.

Y 42. In a heat' system automatically operative to heat Huid when fluid is withdrawn from vsaid system, the combination of a mixer for hot. and cold uid's, a stabilizing reservoir into which said mixer delivers, discharge meansdeading from saidreservoir, means controlling .the admission of hot uid, and a thermostat operatively connected to .said last-named means and subjected to the tem y, rature of the mixture in said reservoir, sai reservoir having such a .volume that the capacity of the vmixture to change tempera- Yture under the action of said mixer asuid is withdrawn from lsaid rervoir Ais on the same order as the capacityof the thermostat .to respond to of temperature in said In testimony whereof we have `signed this speciication.

JEAN V. GIESLER.

WILLIAM CARSON, JIL

deviceand ther-y I Jected to the tcmperature within said reservoir and propor- 

